YH4
GRAND
VITARA
1. To ignition switch
2. “IG
.
COIL METER” fuse
3. ECM (or PCM)
4. CMP sensor
5. Noise suppressor
6. Ignition coil assembly (For No.1 cylinder)
7. Ignition coil assembly (For No.2 cylinder)
8. Ignition coil assembly (For No.3 cylinder)
9. Ignition coil assembly (For No.4 cylinder)
10. Spark plug
11. Ignition coil assembly (For No.5 cylinder)
12. Ignition coil assembly (For No.6 cylinder)
13. To main relay
14. Sensed information
NOTE:
For ECM (PCM) terminal assignment,
refer to SECTION 6E1 or 6E2.
J20 Engine H25 Engine
6F2-2 IGNITION SYSTEM (FOR J20/H25 ENGINES)
GENERAL DESCRIPTION
The ignition system is a direct ignition system. It consists of the parts as described below and has an electronic
ignition control system.
ECM (or PCM)
It detects the engine condition through the signals from the sensors, determines the most suitable ignition timing
and time for electricity to flow to the primary coil and sends a signal to the igniter (in ignition coil assembly).
Ignition coil assembly (including an igniter and an ignition coil)
The ignition coil assembly has a built-in igniter and ignition coil which turns ON and OFF the primary current of
the ignition coil according to the signal from ECM (or PCM). When the ignition coil primary current is turned OFF,
a high voltage is induced in the secondary wiring. One ignition coil is in charge of ignition of one cylinder only.
Spark plug and noise suppressor
CMP sensor, TP sensor, ECT sensor and MAF sensor
For their details, refer to SECTION 6E1 or 6E2.
This ignition system does not have a distributor and high-tension cords but each cylinder has an ignition coil assem-
bly (igniter and ignition coil) and the secondary voltage which occurred in the ignition coil is sent to the spark plug
directly. Also, the signal(s) are sent from the CMP sensor to ECM (or PCM) so as to control each ignition coil inde-
pendently through the igniter (in ignition coil assembly).
SYSTEM WIRING
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